Defensive publication



gt DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Identification is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for '30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 1, 1969 729 549 PROTECTIVE COATING COMPOSITION Robert W. Butler, Wilmington, Del., assignor to Hercules Incorporated, Wilmington, Del., a corporation of Delaware Filed May 16, 1968. Published Apr. 1, 1969 Class 106-171 No Drawing. 16 Pages Specification Disclosed is normally solid edible protective coating compositions (forming coatings of increased strength and resistance to moisture and oxygen transmission) comprising normally solid hot melt film-forming material, including (1) normally solid monoglycerides (U.S. Patent 3,113,868), (2) normally solid C -C fatty acid acylated monoglycerides (U.S. Patent 3,247,142), or (3) normally solid poly(oxyalkylene) glycols, or (4) mixtures of two or more of 1-3, and (5) dissolved in said film-forming material normally solid hydroxypropyl cellulose (U.S. Patent 3,278,521). The maximum hydroxypropyl cellulose/film-forming material weight ratio can be about 9/1 but usually ratio is about 1/50-1/ 1.

The compositions can be prepared by dissolving hydroxypropyl cellulose in molten monoglyceride. They can be used as is or allowed to cool, but preferably articles are coated with the molten composition by dipping or spraying and then allowing to cool and thus solidify. They can also be prepared by dissolving the components in a mutual solvent and evaporating the solvent to form a liquid concentrate. Articles can be coated With the solotion or concentrate and the solvent evaporated to solidify the coating. 

